Slurs not being followed in one vocal part

[Jon Arnold]

Hey folks-

Can anyone tell me why the slurs are not being followed in the soprano part of the attached file? It first occurs in the 2nd half of bar 7, bottom of page 3. It seems to be related to the barLiner function I have (it goes away if I remove it), but I don't understand why this would affect the lyrics.

Here's the function:

barLiner = {
  \repeat unfold 20 { s2 \bar "!" s2. }
  \set Timing.measureLength = #(ly:make-moment 1/2)
  s2 s2
  \set Timing.measureLength = #(ly:make-moment 3/4)
  s2. s2. \bar "|."
 

}

This is called with:

\new Staff \with {
    midiInstrument = "choir aahs"
    instrumentName = "Soprano"
  } { << \soprano \barLiner >> }
  \addlyrics { \sopranoVerse }

Brahms-Nachtens.ly
Description: Text Data

Brahms-Nachtens.pdf
Description: Adobe PDF document